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Optical Engineering

Depth-discrimination-based focus error detection scheme for optical storage applications
Author(s): Christopher David Wright; Jing Zhao; Nicholas A.E. Heyes; Warwick W. Clegg
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Paper Abstract

A novel, differential focus error detection scheme for use in optical recording applications is described. The technique is based on the depth-discrimination property of confocal optical systems. A simple theoretical treatment is used to predict the form of the focus error signal, which is also investigated experimentally using a scanning optical microscope. The focus error response is found to exhibit a more than adequate lock-on range and gain, and is expected to be less sensitive to tracking feedthrough and other forms of cross-talk.

Paper Details

Date Published: 1 October 1995
PDF: 4 pages
Opt. Eng. 34(10) doi: 10.1117/12.210753
Published in: Optical Engineering Volume 34, Issue 10
Show Author Affiliations
Christopher David Wright, Univ. of Manchester (United Kingdom)
Jing Zhao, Univ. of Manchester (United Kingdom)
Nicholas A.E. Heyes, Univ. of Manchester (United Kingdom)
Warwick W. Clegg, Univ. of Manchester (United Kingdom)

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